[DoctorOhh]

Originally Posted by Newby

unfortunately nothing works, and here are the error messages

When you say nothing works it doesn't tell me anything. With no device connected does calibre open. Can you use calibre independent of any device?

Originally Posted by Newby

Unable to open device <calibre.devices.eb600.driver.COOL_ER object at 0xa4a824c>
Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 162, in do_connect
File "site-packages/calibre/devices/usbms/device.py", line 689, in open
File "site-packages/calibre/devices/usbms/device.py", line 609, in open_linux
File "site-packages/calibre/devices/usbms/device.py", line 507, in find_device_nodes
DeviceError: Unable to detect the COOL_ER disk drive.

Unable to open device <calibre.devices.eb600.driver.ITALICA object at 0xa4a830c>
Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 162, in do_connect
File "site-packages/calibre/devices/usbms/device.py", line 689, in open
File "site-packages/calibre/devices/usbms/device.py", line 609, in open_linux
File "site-packages/calibre/devices/usbms/device.py", line 507, in find_device_nodes
DeviceError: Unable to detect the ITALICA disk drive.

Exactly when do you get these errors?

Originally Posted by Newby

exception during JSON decoding
Traceback (most recent call last):
File "site-packages/calibre/ebooks/metadata/book/json_codec.py", line 118, in decode_from_file
File "json/__init__.py", line 278, in load
File "json/__init__.py", line 339, in loads
File "json/decoder.py", line 360, in decode
File "json/decoder.py", line 376, in raw_decode
ValueError: Expecting : delimiter: line 173 column 15 (char 4096)
[Errno 30] Read-only file system: u'/media/Cybook Opus/metadata.calibre'

Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 64, in run
File "site-packages/calibre/gui2/device.py", line 307, in _books
File "site-packages/calibre/devices/usbms/driver.py", line 164, in books
File "site-packages/calibre/devices/usbms/driver.py", line 305, in sync_booklists
File "site-packages/calibre/devices/usbms/driver.py", line 303, in write_prefix
IOError: [Errno 30] Read-only file system: u'/media/Cybook Opus/metadata.calibre'

Traceback (most recent call last):
File "site-packages/calibre/gui2/__init__.py", line 306, in dispatch
File "site-packages/calibre/gui2/device.py", line 1175, in books_uploaded
File "site-packages/calibre/gui2/device.py", line 383, in add_books_to_metadata
File "site-packages/calibre/devices/usbms/driver.py", line 247, in add_books_to_metadata
AttributeError: 'list' object has no attribute 'add_book'

[Errno 30] Read-only file system: '/media/Cybook Opus/eBooks/GmbH, taz Entwicklungs & KG, Co. Medien'

Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 64, in run
File "site-packages/calibre/gui2/device.py", line 372, in _upload_books
File "site-packages/calibre/devices/usbms/driver.py", line 182, in upload_books
File "site-packages/calibre/devices/usbms/device.py", line 949, in create_upload_path
File "os.py", line 157, in makedirs
OSError: [Errno 30] Read-only file system: '/media/Cybook Opus/eBooks/GmbH, taz Entwicklungs & KG, Co. Medien'

These errors are typical of a corrupt file system on your device. reformatting your device and starting fresh might help with these errors. Before you do that ensure your device is backed-up. Contact other Cybook Opus users or the manual to ensure the safe way to reformat your device.